Optical Redox Ratio
Optical Redox Ratio - Related Videos
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Oxidation and Reduction Some chemical reactions can be classified as reduction-oxidation reactions, or redox reactions. Oxidation is the process of matter, like an atom or ionic molecule, losing one or more electrons, and reduction is the process of the matter gaining one or more electrons. Oxidation States Each atom in a molecule has its own oxidation state or oxidation number. The oxidation state describes how oxidized a molecule is relative to its free elemental form. The oxidation state is...
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Redox Reactions
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Cellular Redox Profiling Using High-content Microscopy
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This paper presents a high-content microscopy workflow for simultaneous quantification of intracellular ROS levels, as well as mitochondrial membrane potential and morphology – jointly referred to as mitochondrial morphofunction – in living adherent cells using the cell-permeant fluorescent reporter molecules 5-(and-6)-chloromethyl-2',7'-dichlorodihydrofluorescein diacetate, acetyl ester (CM-H2DCFDA) and tetramethylrhodamine methylester (TMRM).
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We describe the use of two ratiometric, genetically encoded biosensors, which are based on GFP, to monitor mitochondrial redox state and ATP levels at subcellular resolution in living yeast cells.
FAQs
The measured ratio shifts when electron transfer changes the balance between reduced NAD(P)H and oxidized flavins, including FAD. Because oxidative phosphorylation and glycolysis influence that balance, fluorescence changes can reflect metabolic-state differences rather than merely changes in cell number. This makes the metric useful for examining how cellular energy-related processes respond within engineered biological systems.
NAD(P)H and FAD provide complementary endogenous fluorescence signals associated with different redox states. Comparing their relative intensities captures changes in the balance between reduced and oxidized molecules more informatively than considering either signal alone. In bioengineering studies, this paired measurement can help reveal metabolic differences among cells or regions within an engineered tissue.
The optical redox ratio uses autofluorescence from molecules already present in cells, so it does not require exogenous labels. This label-free feature supports noninvasive observation during tissue development and other changing conditions. By avoiding added fluorescent reagents, the approach can provide metabolic information while supporting real-time monitoring of engineered tissues, disease models, and biomaterials.
During fluorescence imaging, endogenous reduced NAD(P)H and oxidized flavins such as FAD are excited to produce autofluorescence signals. The relative intensities of these signals are then compared to calculate the metric. Repeating this measurement across cells, regions, or time points allows investigators to examine metabolic state, changes during development, and variation within an engineered tissue.
Researchers can apply it when they need noninvasive metabolic information from engineered tissues, biomaterials, or disease models. Relevant uses include monitoring tissue development, evaluating cell viability or differentiation, and observing responses to therapeutic or environmental conditions. Because measurements can be made without exogenous labels, the approach is suited to tracking biological changes over time.
Measurements can provide information about cell viability, differentiation, stress, and metabolic heterogeneity. In an engineered tissue, spatial differences in the relative NAD(P)H and flavin signals may indicate that cells or regions occupy different metabolic states. Tracking those differences during development or treatment can help characterize how the construct responds to its biological or environmental context.